The oldest submerged city: A 5,000 old sunken perfectly designed city in Southern Greece In the Peloponnesus region of southern Greece there is a small village called Pavlopetri, where a nearby ancient city dating back 5,000 years resides. However, this is not an ordinary archaeological site – the city can be found about 4 meters underwater and is the oldest known submerged city in the world.

The Marree Man, or Stuart's Giant, is a modern geoglyph discovered by air on 26 June 1998. It appears to depict an indigenous Australian man hunting birds or wallabies with a throwing stick. It lies on a plateau at Finnis Springs in central South Australia. The figure is 2.6 miles tall with a circumference of 9.3 × 17 miles. Although it is the second largest geoglyph in the world, its origin remains a mystery, with not a single witness to any part of the expansive operation.

The ruins of an ancient temple under Lake Titicaca, the world's highest lake. Dating back 1,000 to 1,500 years ago, the ruins are pre-Incan. The Incas, who built Machu Picchu, believed they originated from the lake, and They regarded the lake as the birthplace of their civilisation, and in their myth, the Children of The Sun emerged out of the waters.

In pictures: Prosthetics through time

A model of "the Capua leg", part of the Brought to Life exhibit at the Science Museum in London. Found in Italy, it was the oldest artificial leg excavated and dated to 300BCE. The original was destroyed in an air raid during World War II.

In search of Birdsong: Unearthing the scars of war on a drive through Northern France

Just south of La Boisselle, near Amiens, France is one of the most famous First World War sites – the 300ft-wide Lochnager crater. An extensive network was dug beneath the British front line at La Boisselle in order to plant heavy explosives beneath German defences. http://www.dailymail.co.uk/travel/article-2116540/Picardy-France-tourism-Under-skin-Birdsong-country.html